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Verb ascertain has 4 senses
  1. determine, find, find out, ascertain - after a calculation, investigation, experiment, survey, or study; "find the product of two numbers"; "The physicist who found the elusive particle won the Nobel Prize"
    Sample sentences:
    Somebody ----s something
    Somebody ----s whether INFINITIVE
  2. see, check, insure, see to it, ensure, control, ascertain, assure - be careful or certain to do something; make certain of something; "He verified that the valves were closed"; "See that the curtains are closed"; "control the quality of the product"
    --2 is one way to verify
    Sample sentence:
    Somebody ----s that CLAUSE
  3. determine, check, find out, see, ascertain, watch, learn - find out, learn, or determine with certainty, usually by making an inquiry or other effort; "I want to see whether she speaks French"; "See whether it works"; "find out if he speaks Russian"; "Check whether the train leaves on time"
    Sample sentence:
    They ascertain whether there was a traffic accident
  4. ascertain - learn or discover with certainty
    --4 is one way to
    learn, hear, get word, get wind, pick up, find out, get a line, discover, see
    Sample sentence:
    They ascertain that there was a traffic accident
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